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Review of 2019 Annual Hydrology Report <br />Mine: Williams Fork Mines Date of review: May 2019 <br />Permit No: C198-044 DRMS reviewer: P. Lennberg (GW), R. Reilley (SW) <br />Report Year: 2019 Date received by Division: April 2, 2020 <br />Submitted by: Moffat County Mining (MCM) <br />Requirement <br />Citation <br />Comment <br />1. Hydrology <br />CDRMS <br />Section 2 05.6 of the permit requires MCM to submit the AHR by <br />Report filing <br />regulation <br />March 30 each year. The Division received MCM s 2019 AHR on <br />frequency <br />4.05.13(4)(c) <br />April 2, 2020. <br />2. Timely filing of <br />March 30, <br />See above. <br />hydrology <br />Section 2.05.6 of <br />report <br />the permit. <br />3. Filing frequency <br />All filing dates do not appear to have been met. The Division <br />of NPDES <br />NPDES permit <br />received Q3 and Q4 2019 DMRs in October 2019 and February <br />Discharge <br />CO-0034142 <br />2021 respectively. The AHR indicates that monitoring occurred <br />Monitoring <br />monthly and quarterly for outfalls 003, and 022 as required. <br />Reports <br />4. Timely filing of <br />Inadequate, at a minimum a note to DRMS of no discharge is <br />Discharge <br />NPDES permit <br />required. <br />Monitoring <br />CO-0034142 <br />Reports <br />5. NPDES outfall <br />NPDES permit <br />Three, NPDES discharge points are regularly monitored. <br />sampling <br />CO-0034142 <br />It appears from the AHR that frequency for sampling was complied <br />frequency <br />with. Point 9022 (1SP), constitutes a Strip Pit spoil spring that flows <br />sporadically during spring snow melt, March through June. Table 18 <br />indicates water year monitoring data. It appears that monthly <br />sampling occurred. Outfalls 003 and 024 did not discharge in 2019. <br />Quarterly sampling occurred for total dissolved solids, iron, and <br />6. Parameters to be <br />manganese at outfalls 003. Chronic WET testing took place on an <br />sampled for <br />NPDES permit <br />annual basis. The spoil spring (1 SP), was sampled on a bi weekly <br />NPDES <br />CO-0034142 <br />basis. Table 4 indicates quarterly sampling of TDS should occur <br />and bi monthly sampling of iron. Tables 3B and 4 of the AHR have <br />reporting <br />discrepancies between them. <br />7. NPDES <br />NPDES permit <br />TDS concentrations appeared consistent with historic data, while <br />discharge <br />CO-0034142 <br />recoverable iron shows a slight upward trend within historic ranges. <br />limitations <br />Points 9003 and 9004 experienced no flow in 2017. <br />Seasonal discharge occurred at I SP. No recorded discharge from <br />any on site sediment pond occurred during 2019. <br />Based on a Memorandum of Understanding between the Division <br />of Reclamation, Mining and Safety and the Water Quality Control <br />Division (WQCD), the WQCD enforces CDPS permit conditions. <br />CWQCC <br />The receiving waters (Segment 13b) are designated "Use- <br />8. Basic Standards <br />Regulation 31; <br />Protected". <br />for Surface <br />Antidegradation <br />Water <br />standard Reg <br />38.1 <br />Page 1 <br />